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ereynolds62's avatar
ereynolds62
Aspirant
Aug 13, 2023

Netgear Nighthawk CAX80 Downstream Light Blinking

Good Afternoon

 

The downstream light on my CAX80 is blinking steadily. Everything seems to be working fine with good speed with the internet and all devices stay connected. 

 

I read where if this light is blinking it is scanning for a downstream channel. It seems the only way to get it to stop blinking is to restart the router. 

 

Does anyone know if I just leave it the light will eventually stop blinking when it locks on or is there something else that can be done so I don't have to restart the router to make it stop. 

 

Thanks for the help

6 Replies

    • ereynolds62's avatar
      ereynolds62
      Aspirant
      Aug 14, 2023

      Firmware Version: V2.1.5.2

       

      Cable Connection Status

      Cable Diagnostic
      Status:   Good
      Action:   Your setup looks fine. If you are still experience an internet issue, the   can provide additional troubleshooting info.
      Internet Access: 
      Downstream Status: 
      Upstream Status: 
       Refresh Save Cable Diagnostic Info
       
      Advanced Information
      Frequency Start Value
      This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
      Starting Frequency
       

      Startup Procedure

      ProcedureStatusComment
      Acquire Downstream Channel567 MHzLocked
      Connectivity StateOKOperational
      Boot StateOKOperational
      SecurityEnabledBPI+
       

      Downstream Bonded Channels

      ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
      1Locked256 QAM20567000000 Hz-1.6 dBmV44.3 dB7753
      2Locked256 QAM1453000000 Hz-0.7 dBmV45.2 dB7556
      3Locked256 QAM2459000000 Hz-0.9 dBmV45.1 dB7656
      4Locked256 QAM3465000000 Hz-0.8 dBmV45.1 dB5874
      5Locked256 QAM4471000000 Hz-0.9 dBmV45.0 dB7949
      6Locked256 QAM5477000000 Hz-0.6 dBmV45.1 dB7257
      7Locked256 QAM6483000000 Hz-0.5 dBmV45.2 dB6370
      8Locked256 QAM7489000000 Hz-0.5 dBmV45.2 dB7456
      9Locked256 QAM8495000000 Hz-0.6 dBmV45.1 dB7355
      10Locked256 QAM9501000000 Hz-0.5 dBmV45.2 dB7459
      11Locked256 QAM10507000000 Hz-0.8 dBmV45.0 dB7456
      12Locked256 QAM11513000000 Hz-0.7 dBmV45.0 dB6961
      13Locked256 QAM12519000000 Hz-0.8 dBmV44.9 dB7460
      14Locked256 QAM13525000000 Hz-1.0 dBmV44.9 dB7060
      15Locked256 QAM14531000000 Hz-1.2 dBmV44.8 dB7753
      16Locked256 QAM15537000000 Hz-1.3 dBmV44.7 dB7061
      17Locked256 QAM16543000000 Hz-1.6 dBmV44.5 dB7257
      18Locked256 QAM17549000000 Hz-2.0 dBmV44.3 dB7657
      19Locked256 QAM18555000000 Hz-1.7 dBmV44.3 dB7857
      20Locked256 QAM19561000000 Hz-1.7 dBmV44.3 dB7458
      21Locked256 QAM21573000000 Hz-1.8 dBmV44.3 dB7357
      22Locked256 QAM22579000000 Hz-2.1 dBmV44.1 dB6667
      23Locked256 QAM23585000000 Hz-2.3 dBmV43.8 dB6565
      24Locked256 QAM24591000000 Hz-2.1 dBmV43.9 dB7956
      25Locked256 QAM25597000000 Hz-2.2 dBmV43.9 dB7364
      26Locked256 QAM26603000000 Hz-1.9 dBmV44.1 dB7058
      27Locked256 QAM27609000000 Hz-2.3 dBmV43.8 dB7756
      28Locked256 QAM28615000000 Hz-2.6 dBmV43.5 dB7954
      29Locked256 QAM29621000000 Hz-2.6 dBmV43.5 dB7558
      30Locked256 QAM30627000000 Hz-2.7 dBmV43.5 dB7064
      31Locked256 QAM31633000000 Hz-2.5 dBmV43.6 dB7956
      32Locked256 QAM32639000000 Hz-2.6 dBmV43.5 dB7359
       

      Upstream Bonded Channels

      ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
      1LockedATDMA195120 Ksym/sec29200000 Hz36.8 dBmV
      2LockedATDMA185120 Ksym/sec22800000 Hz35.8 dBmV
      3LockedATDMA175120 Ksym/sec16400000 Hz34.8 dBmV
      4LockedATDMA205120 Ksym/sec35600000 Hz37.0 dBmV
      5Not LockedUnknown0000.0 dBmV
      6Not LockedUnknown0000.0 dBmV
      7Not LockedUnknown0000.0 dBmV
      8Not LockedUnknown0000.0 dBmV
       

      Downstream OFDM Channels

      ChannelLock
      Status      		Modulation /
      Profile ID      		Channel
      ID      		FrequencyPowerSNR /
      MER      		Active Subcarrier
      Number Range      		Unerrored
      Codewords      		Correctable
      Codewords      		Uncorrectable
      Codewords
      1Locked0 ,1 ,2 ,3193957000000 Hz-9.32 dBmV39.4 dB148 ~ 39471640805221370702322
      2Not Locked000 Hz0 dBmV0 dB0 ~ 4095000
       

      Upstream OFDMA Channels

      ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
      1Not Locked000 Hz0 dBmV
      2Not Locked000 Hz0 dBmV
       

      Extended Upstream Transmit PowerEnable Extended Upstream Transmit Power

       

      Current System Time:Mon Aug 14 16:55:48 2023System Up Time:12:10:22

       

      • ereynolds62's avatar
        ereynolds62
        Aspirant
        Aug 14, 2023

        Event Lot

        TimePriorityDescription
        Mon Aug 14 15:50:52 2023Notice (6)CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2 3.;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Mon Aug 14 15:44:57 2023Notice (6)CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2.;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Mon Aug 14 13:53:58 2023Notice (6)CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Mon Aug 14 13:52:57 2023Notice (6)CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Mon Aug 14 04:46:50 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Mon Aug 14 04:46:48 2023Notice (6)DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Mon Aug 14 04:46:24 2023Notice (6)TLV-11 - unrecognized OID;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Jan 1 00:00:50 1970Notice (6)Honoring MDD; IP provisioning mode = IPv6
        Thu Jan 1 00:00:45 1970Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Jan 1 00:00:43 1970Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
        Sun Aug 13 10:32:38 2023Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Sat Aug 12 13:49:27 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Sat Aug 12 13:39:26 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Sat Aug 12 01:22:14 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Jan 1 00:00:44 1970Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Jan 1 00:00:43 1970Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
        Fri Aug 11 14:10:14 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Jan 1 00:00:46 1970Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Jan 1 00:00:44 1970Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:25:58 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:25:56 2023Critical (3)SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:25:56 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:25:40 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:23:04 2023Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:22:59 2023Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:22:59 2023Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:22:58 2023Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:22:20 2023Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:22:13 2023Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:22:10 2023Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:21:14 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:21:14 2023Critical (3)No Ranging Response received - T3 time-out;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:21:12 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:21:10 2023Critical (3)SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:20:56 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:19:34 2023Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:19:33 2023Critical (3)DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:18:52 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:18:50 2023Critical (3)DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;
        Thu Aug 10 02:18:04 2023Critical (3)UCD invalid or channel unusable;CM-MAC=94:18:65:a5:37:db;CMTS-MAC=00:90:f0:5e:04:00;CM-QOS=1.1;CM-VER=3.1;

         

  • FURRYe38's avatar
    FURRYe38
    Guru - Experienced User
    Aug 14, 2023

    Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.

     

    You have some Correctables and Un-correctables that should be zero.

     

    Power of the OFDMA up channel seems a bit too low:

    https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router

    Might ask the ISP about this one.

     

    Power on the down channels are within spec.

     

    Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
    Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
    Be sure your using good quality RG6 coax cable up to the modem. 
    Start with removing any amplifiers, signal attenuators, or splitters from the coax.
    From there check the line for kinks, damage, moisture in the line.
    Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
    Be sure to power OFF the modem for 1 minute then back ON.
    https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853

    https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
    https://highspeed.tips/docsis-events/